/Engine/Source/Runtime/UMG/Public/Blueprint/WidgetTree.h
Gathers descendant child widgets of a parent widget.
static void GetChildWidgets ( [UWidget](API\Runtime\UMG\Components\UWidget) * Parent, [TArray](API\Runtime\Core\Containers\TArray)< [UWidget](API\Runtime\UMG\Components\UWidget) * > & Widgets )